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has been teething

  • present perfect progressive
    of teethe (3rd person singular).
    teethe
    verb (used without object)
    to grow teeth; cut one's teeth.

Example Sentences

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That said, he has been teething more or less without a break since he was two months old, and I’m sure he constantly has some sore spot in his mouth.

From Slate Apr. 19, 2021

He has been teething ever since he was five days old, and he will not cut his last tooth for three years yet.

From Among the Farmyard People by F.C. Gordon